By the way, great-looking frogs! Have you had any breeding activity from them? I do not know much about sexual dimorphism with these frogs, however, I can tell that the smallest frog is darker and likely a male. This corresponds with the sexual dimorphism of other frog species too. For instance, most Ranids exhibit severe variation of size within males and females. So do most bufo-toads. It is pretty easy to see which gender a ranid or bufo-toad is by the age of about 2 (sometimes earlier).
Do you know of any other species that are kept or have been kept in the hobby?
Gastrotheca
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Crested Gecko 0.2.0